Use `DWC2_USB_OTG_FS_TOTAL_FIFO_SIZE` instead of `USB_OTG_FS_TOTAL_FIFO_SIZE` since the latter is only defined in the vendor headers for STM32 MCUs. The STM32-specific problem that `USB_OTG_FS_TOTAL_FIFO_SIZE` is not defined in the vendor headers for all STM32 families has therefore been moved from the driver to the STM32-specific USB device header.
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